Re: HP HDX18-1180ed MaximumGB of RAM
- From: JoSSo <a.b@xxxxx>
- Date: Fri, 27 May 2011 20:06:18 +0200
Heaps of information. Tanx for that, again. I am running Windows 7 64
bit. So that is not the problem.
On Fri, 27 May 2011 12:21:07 -0400, Paul <nospam@xxxxxxxxxx> wrote:
Yes, it is.
Fortunately for you, HP mentions the possibility of supporting 8GB total,
so your installation may work. The way this is stated, means at the
time of manufacture, the laptop may have been verified in the
lab with 2GB modules. But the hardware supports 4GB modules. If
you encounter trouble, then look for a BIOS update from HP.
Memory 4096 MB (2 x 2048 MB)
Supports up to 8 GB of DDR3 memory <----
To take advantage of the total amount of memory, you'll need
an x64 installation of the operating system.
When the new memory is installed, you can use memtest86+ to
do an initial check that the memory is working. The test pattern
you observe, while it's testing, shows how the memory is mapped
(leaving space between 3GB and 4GB for hardware bus addresses).
Scroll half way down that web page, to find the downloadable software.
If the memory completes a couple passes with that tool error free,
then it is safe to boot into Windows.
Once in Windows, further testing should be carried out, with a
stress tester. The reason that is necessary, is because memtest86+
doesn't do a good job of stressing the hardware and uncovering all
possible transient faults. And sitting idle in the desktop, it
takes hundreds of hours of runtime, to spot even one error. A stress
tester program, reduces that discovery time to only a few hours.
I use Prime95 from mersenne.org/freesoft for that, but considering
your machine will have 8GB, it's getting a bit difficult to
cover all of the memory. You can run multiple copies of Prime95
on a computer, but I've noticed instability in Windows when I do that.
It just doesn't like to run too many copies, even when memory
management should be allowing it. Those tests were done on WinXP.
Perhaps Vista/Windows7/x64 will behave better ?
On Fri, 27 May 2011 05:59:11 -0400, Paul <nospam@xxxxxxxxxx> wrote:
Tanx,That is a function of the chipset.
Yes it is using DDR3, currently running 2*2GB 1066 MHZ DDR3.
So upgrading to 2 * 4GB on 1066 is possible.
However will it run with 2 * 4GB 1330 MHz?
Is the chipset PM45 ?
If it is PM45, you can read about it here. The block diagram
says DDR3-1066 is the fastest speed PM45 can run (page 13).
If you install DDR3-1333, and the chipset cannot run
that fast, then it will run the memory at DDR3-1066 instead.
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